Hydrogel Complex Electrospun Scaffolds and Their Multiple Functions in In Situ Vascular Tissue Engineering.

Area of Science:

• Biomaterials Science
• Vascular Engineering
• Regenerative Medicine

Background:

• Poly(ε-caprolactone) (PCLH) scaffolds modified with heparin show promise for vascular tissue engineering.
• Hydrogel complexation offers a strategy to improve scaffold mechanical properties and biological performance.

Purpose of the Study:

• To investigate the impact of hydrogel complexation on the properties and in vivo performance of heparin-modified PCLH scaffolds.
• To evaluate the potential of encapsulated heparin within hydrogels for enhanced vascular regeneration.

Main Methods:

• Preparation of hydrogel complex scaffolds by coating PCLH scaffolds with precursor solutions followed by in situ gelation.
• In vivo implantation in rat abdominal aorta and rabbit carotid artery models.
• Histological, immunohistological, and in vitro release studies to assess scaffold characteristics.

Main Results:

• Hydrogel complexation significantly strengthened scaffolds and slowed degradation.
• Hydrogel scaffolds demonstrated reduced aneurysm incidence and good vascular regeneration in a rat model.
• Encapsulated heparin promoted anticoagulation, anticalcification, and earlier smooth muscle cell (SMC) occurrence in vivo.

Conclusions:

• Hydrogel complexation is a viable strategy to enhance the mechanical and biological properties of vascular scaffolds.
• Encapsulating heparin within hydrogels offers sustained release and improved in vivo regenerative outcomes.
• Hydrogel complex scaffolds show significant potential for improving vascular regeneration and clinical applications.